/*
 * contrib/btree_gist/btree_macaddr.c
 */
#include "postgres.h"
#include "knl/knl_variable.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/builtins.h"
#include "utils/inet.h"

typedef struct {
    macaddr lower;
    macaddr upper;
} macKEY;

/*
** OID ops
*/
PG_FUNCTION_INFO_V1(gbt_macad_compress);
PG_FUNCTION_INFO_V1(gbt_macad_union);
PG_FUNCTION_INFO_V1(gbt_macad_picksplit);
PG_FUNCTION_INFO_V1(gbt_macad_consistent);
PG_FUNCTION_INFO_V1(gbt_macad_penalty);
PG_FUNCTION_INFO_V1(gbt_macad_same);

extern "C" Datum gbt_macad_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_macad_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_macad_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_macad_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_macad_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_macad_same(PG_FUNCTION_ARGS);

static bool gbt_macadgt(const void* a, const void* b)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_gt, PointerGetDatum(a), PointerGetDatum(b)));
}
static bool gbt_macadge(const void* a, const void* b)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_ge, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_macadeq(const void* a, const void* b)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_eq, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_macadle(const void* a, const void* b)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_le, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_macadlt(const void* a, const void* b)
{
    return DatumGetBool(DirectFunctionCall2(macaddr_lt, PointerGetDatum(a), PointerGetDatum(b)));
}

static int gbt_macadkey_cmp(const void* a, const void* b)
{
    macKEY* ia = (macKEY*)(((const Nsrt*)a)->t);
    macKEY* ib = (macKEY*)(((const Nsrt*)b)->t);
    int res;

    res = DatumGetInt32(DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->lower), MacaddrPGetDatum(&ib->lower)));
    if (res == 0)
        return DatumGetInt32(
            DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->upper), MacaddrPGetDatum(&ib->upper)));

    return res;
}

static const gbtree_ninfo tinfo = {gbt_t_macad,
    sizeof(macaddr),
    gbt_macadgt,
    gbt_macadge,
    gbt_macadeq,
    gbt_macadle,
    gbt_macadlt,
    gbt_macadkey_cmp,
    NULL};

/**************************************************
 * macaddr ops
 **************************************************/

static uint64 mac_2_uint64(macaddr* m)
{
    unsigned char* mi = (unsigned char*)m;
    uint64 res = 0;
    int i;

    for (i = 0; i < 6; i++)
        res += (((uint64)mi[i]) << ((uint64)((5 - i) * 8)));
    return res;
}

Datum gbt_macad_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    GISTENTRY* retval = NULL;

    PG_RETURN_POINTER(gbt_num_compress(retval, entry, &tinfo));
}

Datum gbt_macad_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    macaddr* query = (macaddr*)PG_GETARG_POINTER(1);
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    macKEY* kkk = (macKEY*)DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are exact */
    *recheck = false;

    key.lower = (GBT_NUMKEY*)&kkk->lower;
    key.upper = (GBT_NUMKEY*)&kkk->upper;

    PG_RETURN_BOOL(gbt_num_consistent(&key, (void*)query, &strategy, GIST_LEAF(entry), &tinfo));
}

Datum gbt_macad_union(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    void* out = palloc(sizeof(macKEY));

    *(int*)PG_GETARG_POINTER(1) = sizeof(macKEY);
    PG_RETURN_POINTER(gbt_num_union((GBT_NUMKEY*)out, entryvec, &tinfo));
}

Datum gbt_macad_penalty(PG_FUNCTION_ARGS)
{
    macKEY* origentry = (macKEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(0))->key);
    macKEY* newentry = (macKEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(1))->key);
    float* result = (float*)PG_GETARG_POINTER(2);
    uint64 iorg[2], inew[2];

    iorg[0] = mac_2_uint64(&origentry->lower);
    iorg[1] = mac_2_uint64(&origentry->upper);
    inew[0] = mac_2_uint64(&newentry->lower);
    inew[1] = mac_2_uint64(&newentry->upper);

    penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

    PG_RETURN_POINTER(result);
}

Datum gbt_macad_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(
        gbt_num_picksplit((GistEntryVector*)PG_GETARG_POINTER(0), (GIST_SPLITVEC*)PG_GETARG_POINTER(1), &tinfo));
}

Datum gbt_macad_same(PG_FUNCTION_ARGS)
{
    macKEY* b1 = (macKEY*)PG_GETARG_POINTER(0);
    macKEY* b2 = (macKEY*)PG_GETARG_POINTER(1);
    bool* result = (bool*)PG_GETARG_POINTER(2);

    *result = gbt_num_same((GBT_NUMKEY*)b1, (GBT_NUMKEY*)b2, &tinfo);
    PG_RETURN_POINTER(result);
}
